The Iran-contra hearings have been a week of great drama for the country during the summer doldrums, and the theatrics provided by the lawyers, especially the feisty Brendan Sullivan, often seen whispering in Lt. Col. Oliver North's ear, have been particularly riveting. Standing up for his right to advise his client, Sullivan argued to the amusement of the nationwide audience, "I'm not a potted plant." The line seemed especially funny to his colleagues at Williams & Connolly.

Sullivan's office neighbor, attorney David Povich, decided to give him a symbolic gift: Of course it was a potted plant. As it turned out, Povich's potted plant was only the first of a steady supply that has been coming into the office for Sullivan. Povich said yesterday that he and Sullivan had owned a sailboat together called Mistrial. Now Sullivan is in charge of naming a new and bigger boat they have recently purchased, and Povich admits that while he's not completely sold on the idea, it now looks like it will be called The Potted Plant. The Stallones Call It Splits

What is there to believe in anymore? Actor Sylvester Stallone and apprentice actress Brigitte Nielsen are ending their 19-month marriage. And everyone thought that it was a marriage made in heaven -- or at least in a health spa. Bulging biceps Rambo and tall, tall, tall Danish pastry Nielsen clearly seemed made for each other.

Alas, Stallone said he filed for divorce on grounds of irreconcilable differences. This follows months of denials that anything was amiss in the wedded bliss of 41-year-old Rocky/Rambo Stallone and the 24-year-old Nielsen, who once said she fell in love with Stallone when she saw "Rocky" as a teen-ager. Both were married before. Out and About

After long days before the Iran-contra committee, Oliver North can apparently come home to tapes of his performance. No one knows for sure if he is taping all those hours for posterity, but he did buy a VCR last New Year's Eve from Erol's in Sterling Park, Va., and just three weeks ago had a repair technician in to see that the machine was in proper working order. Interestingly, Erol's has no record in its computers that North or his wife is a member of the video rental club, or that he has ever rented a movie there. And to think of all those John Wayne movies he could be watching ...

Back in 1982 and 1983, former White House aide and cabinet member Joseph Califano was appointed special counsel to the House Ethics Committee to investigate the sex-and-drugs scandal in the Capitol Hill page program. But things change. This summer, Califano's 17-year-old daughter Claudia worked as a page in the Democratic Party cloakroom. The Canterbury, Conn., high school senior was there under the sponsorship of Rep. Jack Brooks ...

Another marriage in trouble: Peter Jennings, anchor of the ABC-TV's "World News Tonight," and his wife Kati Marton have agreed to a temporary separation, ABC News said yesterday. The couple have been married eight years ...

Jessica Hahn is about to cash in on her one sexual tryst with fallen television evangelist Jim Bakker. Her attorney is saying that she has signed a contract with a national men's magazine for a pile of money to tell "the entire story." He would only identify the magazine as either Playboy, Penthouse or Esquire. Esquire says it has no deal with her and Penthouse publisher Bob Guccione said late yesterday, "We've made an extremely generous offer and we're waiting to hear back." Playboy publicity manager Elizabeth Norris would only say, "We are working on an agreement with her." The contract doesn't seem to be signed yet, but her Nassau County attorney Dominic Barbara is predicting that with magazine, book and possible movie contracts, Hahn could make a comfortable $2.5 million ...

The country hasn't heard the last of Gary Hart, but his words are going to be expensive. The Rocky Mountain News is reporting that the man who wanted to be president has signed a lecture contract and will be out on the circuit this fall, commanding star fees of at least $20,000 a speech ...